JP2528971Y2 - Carburetor coupling for reed valve type two-cycle engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a carburetor coupling for connecting a carburetor to a reed valve type two-cycle engine having a reed valve installed in an intake hole.

(Prior art and its problems) Conventionally, as a carburetor coupling for connecting a carburetor to a reed valve type two-cycle engine having a reed valve installed in an intake hole, for example, as shown in FIG. , This tubular part
An intake pipe section 52 of the carburetor 51 protruding from one end of 50 in the axial direction.
A cylindrical portion 53 fitted to the outer periphery of the cylindrical portion 50; an outward flange portion 56 projecting radially from the outer periphery of the other end of the cylindrical portion 50 to abut against an outward flange 55 of the reed valve case 54; A pair of tongue-shaped protrusions 57 projecting from the other end of the shaft 50 in the axial direction and abutting against the inner surface of the reed valve case 54 are integrally formed of elastic rubber, and the inside of the outward flange 56 is formed. And a frame-shaped metal reinforcing material 58 is embedded. This carburetor coupling smoothly connects the inner surface of the intake pipe portion 52 of the carburetor 51 having a circular cross section and the inner surface of the reed valve case 54 having a rectangular cross section by the inner surfaces of the cylindrical portion 50 and the protruding portion 57, so that the air is sucked. The flow is smooth, and the output and responsiveness of the engine are improved. That is, the protrusion 57 functioning as an air guide is integrated with the carburetor joint (see Japanese Utility Model Publication No. 50-15052).

However, in such a conventional carburetor joint, since the reinforcing member 58 is not embedded in the protrusion 57, when the protrusion 57 is relatively thin, the protrusion 57 vibrates due to the positive / negative pressure of the intake air, and the gasoline There is an inconvenience that the protruding portion 57 is deformed due to heat or heat, and a smooth flow of intake air is hindered.

(Means for Solving the Problems) The present invention is directed to a cylindrical portion 2 and a cylindrical portion 5 protruding in the axial direction from one end of the cylindrical portion 2 and fitted to the outer periphery of an intake pipe portion 4 of a carburetor 3. And an outward flange 7 of the reed valve case 6 projecting radially outward from the outer periphery of the other end of the cylindrical portion 2.
And a pair of protruding portions 9 protruding in the axial direction from the left and right ends of the other end of the cylindrical portion 2 and abutting on the inner surface of the reed valve case 6 and facing the same. These are integrally formed of elastic rubber, and the inner surfaces of the cylindrical portion 2 and the protruding portion 9 smoothly connect the inner surface of the intake pipe portion 4 of the carburetor 3 having a circular cross section and the inner surface of the reed valve case 6 having a rectangular cross section. The outer flange 8, the cylindrical portion 2, and the projecting portion 9 are connected to each other and project from the frame-shaped main body 10 a in the outward flange 8 through the other end of the cylindrical portion 2. A reinforcement 10 having a longitudinally extending tongue-shaped protrusion 10b made of a hard material and extending near the tip of the portion 9 is integrally embedded and an outward flange frame-shaped body of the reinforcement 10 in the outward flange 8 is provided. The outside protruding surface 10d of the other end of the portion 10a is the outward flange of the reed valve case 6. 7 directly in contact with cylinder 13
A carburetor coupling for a reed valve type two-stroke engine, wherein

(Effect) Hard inside the outward flange 8, the cylindrical portion 2, and the left and right protrusions 9, extending from the outward flange 8 through the other end of the cylindrical portion 2 to near the distal end of the protrusion 9. Since the reinforcing member 10 having the tongue-shaped protrusion 10b having a vertically long cross section made of a material is embedded, the strength of the protrusion 9 is improved, and the protrusion 9 vibrates due to the vertical vibration of the engine and the positive / negative pressure of the intake air. The projection 9 is not deformed by gasoline or heat.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows a reed valve type 2 in one embodiment of the present invention.
FIG. 2 is a longitudinal sectional front view of the carburetor coupling of the cycle engine, FIG. 3 is a sectional view taken along the line III-III in FIG. 1, and FIG. 4 is a sectional view taken along the line IV-IV in FIG. FIG. 5, FIG. 5 is a cross-sectional view taken along the arrow VV in FIG. 1, FIG. 6 is a cross-sectional plan view of the use state of the carburetor joint, and 1 is a carburetor joint.
The carburetor coupling 1 includes a cylindrical portion 2, a cylindrical portion 5 protruding in the axial direction from one end of the cylindrical portion 2 and fitted to the outer periphery of an intake pipe 4 of a carburetor 3, An outward flange portion 8 radially projecting from the outer periphery of the other end of the cylindrical member 2 and abutting against the outward flange 7 of the reed valve case 6; 6
And a pair of tongue-shaped projections 9 that abut against the inner surface of
The whole is integrally formed of elastic rubber. The inside of the outward flange 8, the other end of the tubular portion 2, and the protruding portion 9, from the outward flange 8 through the other end of the tubular portion 2, near the distal end of the protruding portion 9. Is buried. The reinforcing member 10 is made of a metal such as an aluminum alloy or a hard material such as a hard synthetic resin, and has a frame-shaped main body portion 10a embedded in the outward flange 8 and the other end of the cylindrical portion 2. The main body 10a is composed of a pair of tongue-shaped protruding portions 10b integrally protruding from the inner peripheral portion of the main body 10a and embedded in the protruding portion 9. As shown in FIGS. 3 to 5, the pair of protrusions 10b have a substantially elliptical cross-sectional shape and are tapered.

An inner surface 5a of the cylindrical portion 5 is a cylindrical surface, and an annular projection 12 is integrally provided over the entire circumference for sealing between the inner surface 5a and the outer peripheral surface of the intake pipe portion 4. Inner surface of the cylindrical portion 2
2a and the inner surface 9a of the protruding portion 9 are connected to the intake pipe portion 4 having a circular cross section.
In order to smoothly connect the inner surface of the reed valve case 6 and the inner surface of the reed valve case 6 having a rectangular cross section, the cross section smoothly changes from a circular cross section to a rectangular cross section from the intake pipe portion 4 side to the reed valve case 6 side. Although not shown, bolt holes are formed at four corners in the outer peripheral portion of the outward flange portion 8, and bolts (not shown) that penetrate through these bolt holes and are screwed into the cylinder 13 of the engine. ), The carburetor joint 1 and the reed valve case 6 are fixed to the cylinder 13. These bolts penetrate the main body 10a of the reinforcing member 10. On the other end surface 8a of the outward flange portion 8, a frame-shaped annular projection 15 is integrally provided so as to be sealed with the outward flange 7. As is well known, the reed valve case 6 inserted into the intake hole 13a of the cylinder 13 has a rectangular shape in plan view and a triangular shape which is tapered when viewed from the front. A reed valve 17 is arranged so as to cover the hole 16. And reed valve case 6
Both ends of the free end of the partition plate 18 provided integrally with the front end of the pair of projections 9 are formed with grooves 19 (second
(Fig.). Reference numeral 20 (FIG. 6) denotes a band for fixing the cylindrical portion 5 to the intake pipe portion 4. Since the axis of the intake pipe 4 of the carburetor 3 does not match the axis of the intake hole 13a of the cylinder 13, the axis of the carburetor joint 1 is bent.

Next, the operation will be described. During the operation of the engine, the air-fuel mixture, that is, the intake air, flows from the intake passage having a circular cross section of the intake pipe section 4 to the intake passage having a rectangular cross section in the reed valve case 6 within the cylindrical portion 2 and the protrusion 9 of the carburetor joint 1. Flows smoothly through an intake passage whose cross-sectional shape smoothly changes from circular to rectangular. Therefore, the output and responsiveness of the engine can be improved. In addition, the protruding portion 1 protruding from the main body 10a
0b, and these projections 10b are located within the projections 9 of the carburetor coupling 1, so that the strength of the projections 9 is improved. Deformation of the protruding portion 9 due to heat or heat can be prevented. Therefore, a smooth flow of intake air can always be maintained satisfactorily, and the output and response of the engine can be improved.

(Effects of the Invention) As described above, according to the present invention, the frame-shaped main body 10 a in the outward flange 8 is provided inside the left and right protrusions 9.
A tongue-shaped protrusion 10b made of a hard material extending from the other end of the cylindrical portion 2 to the vicinity of the tip of the left and right protrusion 9.
Since the reinforcing member 10 having the following structure is embedded integrally, the vertical deformation of the joint tubular portion 2 can be effectively prevented against vertical vibration, and the performance of the vaporizer 3 is stabilized, and the engine Performance is improved. In addition, since the strength of the protrusion 9 is improved, it is possible to prevent the protrusion 9 from vibrating due to the positive / negative pressure of the intake air and from being deformed by gasoline or heat. Therefore, a smooth flow of intake air can always be maintained satisfactorily, and the output and response of the engine can be improved. Moreover,
The reed valve case 6 and the carburetor joint 1 can be accurately and firmly fixed to the cylinder 13.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view of a carburetor coupling of a reed valve type two-stroke engine according to an embodiment of the present invention, FIG. 2 is a vertical front view thereof, and FIG. 3 is a cross-sectional view taken along the line III-III in FIG. ,
4 is a cross-sectional view taken along the line IV-IV in FIG. 1, FIG. 5 is a cross-sectional view taken along the line VV in FIG. 1, FIG. 6 is a cross-sectional plan view of the use state of the carburetor joint, and FIG. FIG. 10 is a cross-sectional plan view of a conventional carburetor joint in use. 1 ... carburetor joint, 2 ... tubular part, 3 ... carburetor, 4 ...
... intake pipe part, 5 ... cylindrical part, 6 ... reed valve case, 7 ... outward flange, 8 ... outward flange part,
9 Projection, 10 Reinforcement

Claims (1)

(57) [Scope of request for utility model registration] 1. A tubular part (2) and an intake pipe part (4) of a carburetor (3) projecting from one end of the tubular part (2) in the axial direction.
And a cylindrical portion (5) fitted to the outer periphery of the cylindrical member (2), and an outer portion protruding radially outward from the outer periphery of the other end of the cylindrical portion (2) and abutting against the outward flange (7) of the reed valve case (6). A pair of protruding portions (9) protruding in the axial direction from the left and right ends of the other end of the cylindrical portion (2) and abutting against the inner surface of the reed valve case (6). These are integrally formed of elastic rubber, and have a circular cross section with the inner surface of the intake pipe (4) of the carburetor (3) having a circular cross section by the inner surfaces of the cylindrical portion (2) and the protruding portion (9). Connect the inner surface of the rectangular reed valve case (6) smoothly,
Inside the outward flange portion (8), the tubular portion (2), and the protruding portion (9), the frame-shaped main body portion (10a) inside the outward flange portion (8) and the tubular portion (2). A reinforcement member (10) having a vertically long tongue-shaped projection (10b) made of a hard material and extending to the vicinity of the tip of the left and right projection (9) through the other end of the slab, and integrally buried and outward flanged Reinforcement in section (8) (1
0) The outwardly projecting surface (10d) of the other end of the frame-shaped body (10a) of the outward flange directly contacts the outward flange (7) of the reed valve case (6) and is fastened to the cylinder (13). A carburetor coupling for a reed valve type two-stroke engine, wherein the carburetor coupling is provided.